Using the isothermal transformation diagram for a 0.45 wt% C steel alloy (Animated Figure 10.40), determine the approximate percentages of the microconstituents that form the final microstructure of a small specimen that has been subjected to the following time– temperature treatments. In each case assume that the specimen begins at 845°C (1550°F), and that it has been held at this temperature long enough to have achieved a complete and homogeneous austenitic structure.

Welding: Principles and Applications (MindTap Course List)
8th Edition
ISBN:9781305494695
Author:Larry Jeffus
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Chapter26: Welding Metallurgy
Section: Chapter Questions
Problem 14R: Approximately how many degrees wide is the transition range at the 0.1 carbon alloy?
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Using the isothermal transformation diagram for a 0.45 wt% C steel alloy (Animated Figure 10.40), determine the approximate percentages of the microconstituents that form the final microstructure of a small specimen that has been subjected to the following time– temperature treatments. In each case assume that the specimen begins at 845°C (1550°F), and that it has been held at this temperature long enough to have achieved a complete and homogeneous austenitic structure.

Rapidly cool to 450°C (840°F), hold for 10 s, then quench to room temperature.
martensite
%
ferrite
bainite
spheroidite
austenite
Transcribed Image Text:Rapidly cool to 450°C (840°F), hold for 10 s, then quench to room temperature. martensite % ferrite bainite spheroidite austenite
Time = 1 · 10E-1 s
Temperature = 0 °C
Temperature = 32 °F
%3D
900
1600
800
A + F
A
1400
700
1200
`A + P
600
1000
500
FA+ B
800
50%
400
M (start)
M (50%)
600
300
M (90%)
200
400
100
200
01
102
Time (s)
1
10
103
104
105
Temperature (°C)
T
Temperature (°F)
Transcribed Image Text:Time = 1 · 10E-1 s Temperature = 0 °C Temperature = 32 °F %3D 900 1600 800 A + F A 1400 700 1200 `A + P 600 1000 500 FA+ B 800 50% 400 M (start) M (50%) 600 300 M (90%) 200 400 100 200 01 102 Time (s) 1 10 103 104 105 Temperature (°C) T Temperature (°F)
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